The cash register broke down, so checkout took a long time.
checkout counter; cashier
Refers to the place where you pay, or the person operating the register. Common in retail and restaurant contexts.
Please pay at the checkout counter.
The cashier was very kind.
There were a lot of people lined up at the checkout, so it took a bit of time.
Once you've chosen your items, please pay at the checkout.
I brought the clothes I'd chosen to the checkout.
The checkout is always busy in the evening.
self-checkout; automated checkout